Ice cubes made from stone - do these work?

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I was looking in a Japanese magazine that featured cups and such made from stone. They were selling small ice-cubed shape stones. A dozen for $30. The picture in the ad featured a cocktail with these stone ice cubes.

Do these work? Benefit would be I could throw away my ice cube trays and no longer deal with watered down drinks.....

the ad said that the beer mugs kept the beer very cold. I may at least buy one of these. The beer mugs were $50.

For this episode of Take 5, we head to Hollywood where the food and drink scene is often mistakenly overlooked. Our host Joey takes us to five spots that are perfect for anyone in search of a good bite or drink in Tinseltown.

Take 5 is a video series that explores a city’s thriving dining scene, hosted by our very own Joey Skladany. We feature five restaurants in five different categories, hand-picked by five local celebrities and influencers.
In this episode, we head to Atlanta for restaurant picks from reality TV star Ms. Juicy, CBS Sports writer Barrett Sallee, TV and Broadway star Merle Dandridge, CNN/HLN journalist Henna Bakshi, and Joey’s first grade teacher Freda Hubbard Pittard.
Our list includes: MetroFresh, Irby’s Tavern, Yebo Ski/Beach Haus, R. Thomas’ Deluxe Grill,
and Sublime Donuts.